银行卡是日常生活重要组成部分。每张银行卡信息包含账号、持卡人姓名、身份证号码、地址、存款余额。本任务只要求编写一个方法showCardInfo()完成存款、取款、查询。java代码

在Java中，我们可以创建一个BankCard类来表示银行卡的基本信息，并提供一些基本操作方法。这里是一个简单的示例，展示了如何实现`showCardInfo()`方法以及存款(deposit()), 取款(withdraw()), 查询(balanceQuery())等操作：

import java.util.Scanner;

class BankCard {
    private String account;
    private String holderName;
    private String idNumber;
    private String address;
    private double balance;

    // 构造函数
    public BankCard(String account, String holderName, String idNumber, String address) {
        this.account = account;
        this.holderName = holderName;
        this.idNumber = idNumber;
        this.address = address;
        this.balance = 0.0;
    }

    // 显示卡片信息
    public void showCardInfo() {
        System.out.println("Account: " + account);
        System.out.println("Holder Name: " + holderName);
        System.out.println("ID Number: " + idNumber);
        System.out.println("Address: " + address);
        System.out.println("Balance: " + balance);
    }

    // 存款方法
    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            System.out.println("Deposit successful. New balance: " + balance);
        } else {
            System.out.println("Invalid deposit amount.");
        }
    }

    // 取款方法
    public boolean withdraw(double amount) {
        if (amount <= balance) {
            balance -= amount;
            System.out.println("Withdrawal successful. New balance: " + balance);
            return true;
        } else {
            System.out.println("Insufficient balance for withdrawal.");
            return false;
        }
    }

    // 查询余额方法
    public double balanceQuery() {
        return balance;
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        BankCard card = new BankCard("123456789", "John Doe", "1234567890123456", "123 Street");
        
        System.out.println("Enter operation:");
        System.out.println("1. Show Card Info");
        System.out.println("2. Deposit");
        System.out.println("3. Withdraw");
        System.out.println("4. Check Balance");
        int choice = scanner.nextInt();
        switch (choice) {
            case 1:
                card.showCardInfo();
                break;
            case 2:
                System.out.println("Enter deposit amount:");
                double depositAmount = scanner.nextDouble();
                card.deposit(depositAmount);
                break;
            case 3:
                System.out.println("Enter withdrawal amount:");
                double withdrawAmount = scanner.nextDouble();
                card.withdraw(withdrawAmount);
                break;
            case 4:
                double balance = card.balanceQuery();
                System.out.println("Current Balance: " + balance);
                break;
            default:
                System.out.println("Invalid choice!");
        }
        scanner.close();
    }
}

在这个示例中，用户可以通过输入选择不同的操作，然后按照提示进行存款、取款或查看余额。